ARM: gic: fix irq_alloc_descs handling for sparse irq

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Commit "ARM: gic: add irq_domain support" (b49b6ff) breaks SPARSE_IRQ
on platforms with GIC. When SPARSE_IRQ is enabled, all NR_IRQS or
mach_desc->nr_irqs will be allocated by arch_probe_nr_irqs(). This caused
irq_alloc_descs to allocate irq_descs after the pre-allocated space.

Make irq_alloc_descs search for an exact irq range and assume it has
been pre-allocated on failure. For DT probing dynamic allocation is used.
DT enabled platforms should set their nr_irqs to NR_IRQ_LEGACY and have all
irq_chips allocate their irq_descs with irq_alloc_descs if SPARSE_IRQ is
enabled.

gic_init irq_start param is changed to be signed with negative meaning do
dynamic Linux irq assigment.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

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Rob Herring 2011-10-21 17:14:27 -05:00 • committed by Arnd Bergmann

parent b3f7ed0324

commit f37a53cc5d

2 changed files with 12 additions and 5 deletions

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15

arch/arm/common/gic.c

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2

arch/arm/include/asm/hardware/gic.h

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